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📝 Vectoring Data Formats for 8259

📖 From An Introduction To Microprocessor 8085 • 11. Programmable Interrupt Controller: 8259 • 12 questions available

Practice MCQs for Vectoring Data Formats for 8259. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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📝 Sample Questions

Q1. A system designer needs to connect counter 0 of an 8253 to generate a periodic interrupt every 10 ms using a 1 MHz clock. Which pin must receive the clock signal and which pin provides the output to the interrupt controller?

🔹 A. Pin 9 receives clock, Pin 10 provides output

🔹 B. Pin 9 receives clock, Pin 11 provides output

🔹 C. Pin 10 receives clock, Pin 9 provides output

🔹 D. Pin 11 receives clock, Pin 10 provides output

💡 Difficulty: easy | ✅ Correct: B

Q2. If a microprocessor writes a mode word to configure counter 2 for square‑wave generation, which combination of control signals (CS, RD, WR, A1, A0) must be asserted low/high?

🔹 A. CS=0, RD=0, WR=1, A1=1, A0=0

🔹 B. CS=0, RD=1, WR=1, A1=1, A0=1

🔹 C. CS=1, RD=1, WR=0, A1=1, A0=1

🔹 D. CS=0, RD=1, WR=0, A1=1, A0=1

💡 Difficulty: medium | ✅ Correct: D

Q3. A designer connects A0 and A1 to the address bus to select counter 2 and the control word register simultaneously. If the address line values are A1=1, A0=0, which device is being addressed and what operation can be performed by asserting WR low?

🔹 A. Counter 0, reading its count value

🔹 B. Counter 1, loading a count value

🔹 C. Counter 2, writing a mode word

🔹 D. Control word register, reading mode word

💡 Difficulty: hard | ✅ Correct: C

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🔗 Related Topics

📝 Programmable Interrupt Controller 8259 📝 Block Diagram of 8259 📝 Interfacing of 8259A with 8085A 📝 Initialization of 8259 📝 Initialization Command Words(ICWs) of 8259

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